SANAA - Yemeni forces loyal to President Ali Abdullah Saleh fired at a protest march in Sanaa on Sunday, wounding at least 22 people, doctors said, heightening tension as opposition leaders met Gulf Arab mediators in Saudi Arabia. Doctors said around 200 more demonstrators were overcome by tear gas during the clashes when they marched outside their normal protest zone in the streets near Sanaa University, a hub of pro-democracy demonstrations that have lasted three months. "We neared the Sanaa Trade Center when police confronted us with tear gas, and suddenly opened heavy gunfire on us from all directions," said Sabry Mohammed, a protester. "A state of terror set in among the demonstrators, and some of them fled into side streets."